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Bendix/King (Honeywell) KT 73 Transponder with Serial Altitude Data Input
The KT 73 must be configured to accept serial altitude data on pin 7 of the main connector, and software
configured for High Resolution M (IIMorrow). 1200bps, 7 data bits, 1 stop bit and odd parity.
The Trans-Cal SSD120-(XX)N-RS5 must be software configured to transmit the correct serial data protocol to the
Bendix/King KT 73 transponder as described below.
1. Connect the SSD120 to an IBM compatible computer running HyperTerminal as described in §4.5 and as
shown in the Dynamic Calibration Block Diagram. Assign the serial port protocols as follows:
2. Apply power to the digitizer and after the self-test time has elapsed, altitude data will appear on the PC screen.
Type:
<enter>
Type: ADJ<enter>
Type: P<enter>
The SSD120 will respond with a three-digit number as follows:
Serial Altitude Data Resolution
Type: P266<enter>
Type: P<enter>
Type: QQ
The SSD120 will respond with ?>(current altitude)
Accesses the SSD120 adjustment program.
The digitizer will respond with A=
Identifies the current serial port settings.
Default factory setting is 000.
0 0 0
TxD1 TxD2 TxD3
Protocol
The first digit represents the serial altitude data resolution.
The second digit represents the protocol selection for TxD1, TxD2 & TxD3.
The third digit represents the protocol selection for TxD4 & TxD5.
This selects 10' resolution and transmits the IIMorrow data
format/message on all five serial data outputs.
The digitizer should return 266>current altitude.
This confirms the change has been stored in the EEPROM.
The encoder is now configured to transmit the high resolution IIMorrow protocol
on all five serial data ports.
REMOVE ALL JUMPERS FROM THE SSD120-(XX)N-RS5
SERIAL DATA D-SUB CONNECTOR!
Page 30 of 57
TxD4 & TxD5 Protocol
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